Uncle Mike's Quick Detachable Sling Swivels for Most Pumps and Autos (Blued, 1-Inch Loop) The unique quick detachable (QD) design stops the metal swivel body from contacting the gun The close Machining tolerances provide smooth and silent operation Mounts on most pumps and autos except Browning 2000, Winchester 1400, ithaca 37, savage 30, sears 21, 30 or stevens pumps Universal swivel set mounts on pumps and autos Cap modification required Swivel Lock spring-loaded plunger and a knurled, threaded sleeve eliminates accidental opening of the swivel Does not fit Browning 2000, W-Inchter 1400, Ithaca 37, Savage 30, Sears 21 or Stevens pumps; will not work on gas-operated recoil